CN111374801B

CN111374801B - Implant loading tool and medical device

Info

Publication number: CN111374801B
Application number: CN201811653500.XA
Authority: CN
Inventors: 梅杰; 刘美辰; 吴旭闻; 桂宝珠; 陈国明; 李�雨
Original assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Current assignee: Shanghai Microport Cardioflow Medtech Co Ltd
Priority date: 2018-12-28
Filing date: 2018-12-28
Publication date: 2024-07-12
Anticipated expiration: 2038-12-28
Also published as: KR102545918B1; WO2020135430A1; KR20210106557A; ES2946015T3; EP3903735A1; EP3903735A4; CN111374801A; EP3903735B1

Abstract

The invention provides a loading tool and a medical device of an implant, wherein the loading tool of the implant comprises a guide cover and a guide seat, one of the guiding covers is provided with a first buckling part and a second buckling part, the other guiding seat is provided with the first buckling seat and the second buckling seat, the first buckling part is matched and buckled with the first buckling seat, namely, the radial displacement and the axial displacement of the guide cover and the guide seat are limited, the guide cover and the guide seat are in a coaxial stable state, and the conical head of a conveying device is conveniently sleeved in the guide cover and the guide seat so as to compress the implant; and then the second buckle portion and the second buckle seat are matched and clamped, radial displacement, axial displacement and circumferential rotation of the guide cover and the guide seat can be limited, the guide cover and the guide seat are in a relatively fixed state, and the implant can be prevented from twisting, tilting or wearing in the compression process. In addition, adopt buckle portion and buckle seat to match the mode of block to connect guide lid and guide seat, convenient operation has improved the loading efficiency of implant.

Description

Implant loading tool and medical device

Technical Field

The invention relates to the field of medical instruments, in particular to a loading tool and a medical device of an implant.

Background

Interventional aortic valve implantation is a completely new minimally invasive valve replacement technique developed in recent international years, and the principle is that a valve prosthesis (comprising a stent) is loaded into a delivery device and delivered to the aortic root by means of a catheter, and after the stent is released, the valve prosthesis can be ensured to be fixed to the aortic annulus to replace a primary valve with degraded function, so that the heart function of a patient is improved. The technique can treat the aortic valve valvular disease without opening chest and cardiac arrest, and avoids the huge trauma to patients caused by the prior surgical chest opening operation and cardiac arrest.

This technique requires the stent to be compressed to a small diameter for loading into the delivery catheter. The stent or the valve on the stent is easy to damage or break due to over-compression, uneven compression or local accidental bending, and finally the function of the stent or the valve is defective or the service life is reduced, and even the stent or the valve can not be implanted or operated normally. Particularly, when the self-expanding stent is loaded, the self-expanding stent is less likely to be fixed and compressed due to the tension of the self-expanding stent, and is more likely to be damaged or broken, so that the loading becomes more difficult. The technical requirements on loading personnel are higher on the one hand, and on the other hand, the implantation operation time is prolonged intangibly, and the operation risk is increased.

When loading the valve prosthesis with a loading tool, the stent is typically initially compressed using a guide cap in cooperation with a guide seat, then the guide cap and guide seat are opened, and the inflow tract of the stent is further compressed using the lumen of the guide seat until the valve prosthesis is fully crimped. The primary compression realizes the compression and partial loading of the stent, but the prior loading tool is utilized, the stent is easy to twist and incline in the primary compression process, so that the stent is deformed or damaged, the subsequent operation is directly influenced, and even the loading is failed or the use of an implant is influenced.

Therefore, there is a need for a loading device that is simple to operate and has high loading efficiency.

Disclosure of Invention

The invention aims to provide a loading tool and a medical device for an implant, which are used for solving the problem that the existing loading device is easy to twist and incline in use so as to deform or damage the implant.

In order to solve the above problems, the present invention provides an implant loading tool, which includes a guide cover and a guide seat for detachably connecting with the guide cover, wherein the guide cover has a first end and a second end opposite to each other along an axial direction, and the guide seat has a third end and a fourth end opposite to each other along an axial direction; the guide cover is provided with a first inner cavity which is penetrated, and the guide seat is used for penetrating the first inner cavity from the first end to the second end in the direction from the third end to the fourth end;

One of the guide cover and the guide seat is provided with a first buckling part and a second buckling part, and the other one of the guide cover and the guide seat is provided with a first buckling seat and a second buckling seat; the first buckling part is used for matching and buckling with the first buckling seat so as to limit radial displacement and axial displacement of the guide cover relative to the guide seat; the second buckling part is used for matching and buckling with the second buckling seat so as to limit radial displacement, axial displacement and circumferential rotation of the guide cover relative to the guide seat;

wherein, in the guide seat penetrates the in-process of first inner chamber, first buckle portion with distance between the first buckle seat is less than second buckle portion with distance between the second buckle seat.

Optionally, the first fastening part and the second fastening part are disposed on the guide cover, and the first fastening seat and the second fastening seat are disposed on the guide seat; the first clamping part is provided with a first clamping surface facing the second end and a first combining surface facing the inside of the guide cover, and the first clamping seat is provided with a second clamping surface facing the third end and a second combining surface facing the outside of the guide seat; the first combining surface is used for propping against the second combining surface to limit the radial displacement of the guide cover relative to the guide seat, and the first clamping surface is used for propping against the second clamping surface to limit the axial displacement of the guide cover relative to the guide seat, so that the first clamping part is matched and clamped with the first clamping seat.

Optionally, the second fastening part includes a plurality of second fasteners, and the second fastening seat includes a plurality of second fastening slots matched with the second fasteners; the second card slot is configured to:

During the process of penetrating the guide seat into the first inner cavity, limiting radial displacement and circumferential rotation of the guide cover relative to the guide seat;

after the guide seat penetrates into the first inner cavity, radial displacement, axial displacement and circumferential rotation of the guide cover relative to the guide seat are limited.

Optionally, each of the second buckles has a first inclined plane; each second clamping groove is provided with a second inclined plane matched with the first inclined plane, and the first inclined plane forms an included angle with the axial direction of the guide cover; in the process that the guide seat penetrates into the first inner cavity, the second inclined surface abuts against the first inclined surface.

Optionally, an anti-skid groove is arranged on the first inclined plane.

Optionally, each second buckle is provided with a third limiting surface arranged along the circumferential direction of the guide cover, and each second clamping groove is provided with a fourth limiting surface matched with the third limiting surface; the third limiting surface and the fourth limiting surface are abutted against each other to limit circumferential rotation of the guide cover relative to the guide seat.

Optionally, each second buckle has a third clamping surface disposed towards the second end, and each second clamping groove has a fourth clamping surface matched with the third clamping surface; after the guide seat penetrates into the first inner cavity, the third clamping surface and the fourth clamping surface are abutted against each other to limit axial displacement of the guide cover relative to the guide seat.

Optionally, the second buckles are uniformly distributed along the circumferential direction of the guiding cover, and the second clamping grooves are uniformly distributed along the circumferential direction of the guiding seat.

Optionally, when the first fastening portion is fastened with the first fastening seat in a matching manner, a part of the second fastening portion enters the second fastening groove, so as to limit axial radial displacement and circumferential rotation of the guide cover relative to the guide seat.

Optionally, the cross-section of the first lumen gradually decreases from the first end to the second end.

Optionally, the first inner cavity includes a first region, a second region, a third region and a fourth region connected in sequence from the first end to the second end;

The inner diameter of the first area is kept unchanged along the axial direction of the guide cover, and a plurality of tooth grooves are formed in the end part, close to the first end, of the first area along the circumferential direction;

the inner diameter of the second region near the first end is larger than the inner diameter of the fourth region near the second end;

The inner diameter of the third region near the first end and the inner diameter near the second end are smaller than the inner diameter of the second region near the first end and larger than the inner diameter of the fourth region near the second end.

Optionally, the cross sections of the first region, the second region, the third region and the fourth region are all circular, and the bus bars of the first region, the second region, the third region and the fourth region are all straight lines; and bus bars of the first zone, the second zone, the third zone and the fourth zone are in smooth transition.

Optionally, the cross sections of the first region, the second region, the third region and the fourth region are all circular, the bus of the third region and/or the bus of the fourth region is a curve, and the bus of the third region is in smooth transition with the bus of the fourth region and the bus of the second region respectively.

Optionally, the guide seat has a second inner cavity penetrating along the axial direction, and the cross section of the second inner cavity gradually decreases from the third end to the fourth end.

Optionally, the second inner cavity sequentially comprises a fifth area and a sixth area which are connected from the third end to the fourth end;

the inner diameter of the fifth region near the third end is larger than the inner diameter of the fifth region near the fourth end;

The inner diameter of the sixth region near the third end is equal to the inner diameter of the fifth region near the fourth end and is not smaller than the inner diameter of the sixth region near the fourth end.

Optionally, the cross sections of the fifth area and the sixth area are circular, and the generatrix of the fifth area and the sixth area is straight; and the bus bars of the fifth zone and the sixth zone are in smooth transition. In some embodiments, the generatrix of the sixth zone may also be a smoothly transitioned arc.

Optionally, a fixing groove with a notch is formed in the outer wall of the guide seat along the circumferential direction, and the notch of the fixing groove faces the direction of the fourth end.

Optionally, when the second fastening portion is fastened with the second fastening seat in a matching manner, the fourth end extends out of the second end along the direction from the first end to the second end.

Optionally, the outer peripheral walls of the guide cover and the guide seat are provided with anti-slip structures, so that the guide cover and the guide seat are convenient to grasp.

Optionally, the guiding cover is made of transparent material, and an indicating ring is arranged on the guiding cover along the circumferential direction to indicate the loading progress of the implant.

To solve the above problems, the present invention also provides a medical device comprising a loading tool for an implant as described above, and further comprising a delivery device, the loading tool being adapted to cooperate with the delivery device to load an implant into the delivery device.

Optionally, the implant is a valve stent.

In summary, in the implant loading tool and the medical device provided by the present invention, the implant loading tool includes a guide cover and a guide seat, one of the guide cover and the guide seat is provided with a first fastening portion and a second fastening portion, the other one of the guide cover and the guide seat is provided with a first fastening seat and a second fastening seat, and the first fastening portion and the first fastening seat are engaged in a matching manner, i.e. radial displacement and axial displacement of the guide cover and the guide seat are limited; and the second buckling part is matched and buckled with the second buckling seat, so that radial displacement, axial displacement and circumferential rotation of the guide cover and the guide seat can be limited. When the first buckling part is matched and buckled with the first buckling seat, the guide cover and the guide seat do not have radial displacement, the axial displacement is limited to be in a coaxial stable state, so that the conical head of the conveying device is conveniently sleeved in, and the implant is conveniently compressed in the next step; when the second buckling part is matched and buckled with the second buckling seat, the guide cover and the guide seat do not have radial displacement, axial displacement and circumferential rotation, and the guide cover and the guide seat are in a relatively fixed state, so that the implant can be prevented from being twisted, inclined or worn in the compression process. In addition, adopt buckle portion and buckle seat to match the mode of block to connect guide lid and guide seat, convenient operation has improved the loading efficiency of implant.

Drawings

Those of ordinary skill in the art will appreciate that the figures are provided for a better understanding of the present invention and do not constitute any limitation on the scope of the present invention. Wherein:

FIG. 1 is a front view of a guide cap of a loading tool for an implant according to one embodiment of the present invention;

FIG. 2 is an axial cross-sectional view of the lead cap shown in FIG. 1 along line A-A;

FIG. 3 is an axial cross-sectional view of a guide cap of an implant loading tool provided in a preferred embodiment of the present invention;

FIG. 4 is a front view of a guide seat for an implant loading tool according to one embodiment of the present invention;

FIG. 5 is an axial cross-sectional view of the pilot cap of FIG. 4 taken along line B-B;

FIG. 6 is a front view of an implant loading tool with a guide cap mated with a guide seat according to one embodiment of the present invention;

FIG. 7 is an axial cross-sectional view of the loading tool of the implant shown in FIG. 6 along line C-C;

FIG. 8 is a schematic view of a conveying apparatus according to an embodiment of the present invention;

FIG. 9 is a front view of a delivery device for use with an implant loading tool according to one embodiment of the present invention, wherein the delivery device is used with a fourth end of the guide;

FIG. 10 is an axial cross-sectional view of the delivery device of FIG. 9 mated with a loading tool for an implant;

FIG. 11 is a front view of a delivery device for use with an implant loading tool according to one embodiment of the present invention, wherein the delivery device is configured for use with a third end of the guide;

FIG. 12 is an axial cross-sectional view of the delivery device of FIG. 11 mated with a loading tool for an implant;

fig. 13 is a schematic view of an implant according to an embodiment of the present invention.

In the accompanying drawings:

1-a guide cover; 100-a first lumen; 101-a first end; 102-a second end; 11-an indicator ring; 12-a second snap-fit portion; 121-a first incline; 122-a third engagement surface; 123-a third limiting surface; 124-a fifth limiting surface; 13-a first zone; 14-fourth zone; 15-a third zone; 16-a second zone; 17-a first catch; 171-a first engagement surface; 172-a first bonding surface; 17-a first catch; 180-tooth grooves; 181-slot space; 19-an anti-slip structure;

2-a guide seat; 200-a second lumen; 201-a third end; 202-fourth end; 21-a top seat head end; 22-a first buckle seat; 221-a second engagement surface; 222-a second bonding surface; 23-a fixed groove; 24-a second buckle seat; 241-a second bevel; 242-fourth engagement surface; 243-fourth limit surfaces; 244-slot cavity; 25-fifth zone; 26-sixth zone;

5-a conveying device; 54-conical head; 55-fixing the head; 56-sheath;

9-valve stent; 91-hanging lugs; 92-an inflow channel; 93-outflow tract.

Detailed Description

The invention will be described in further detail with reference to the drawings and the specific embodiments thereof in order to make the objects, advantages and features of the invention more apparent. It should be noted that the drawings are in a very simplified form and are not drawn to scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. Furthermore, the structures shown in the drawings are often part of actual structures. In particular, the drawings are shown with different emphasis instead being placed upon illustrating the various embodiments.

As used in this specification and the appended claims, the singular forms "a," "an," and "the" include plural referents unless the content clearly dictates otherwise. As used in this specification and the appended claims, the term "or" is generally employed in its sense including "and/or" and, unless the content clearly dictates otherwise, the term "proximal" is generally employed near the end of the operator and the term "distal" is generally employed near the end of the patient's lesion.

The invention provides a loading tool and a medical device of an implant, which comprise a guide cover and a guide seat, wherein the guide seat is used for being detachably connected with the guide cover, the guide cover is provided with a first end and a second end which are opposite along the axial direction, and the guide seat is provided with a third end and a fourth end which are opposite along the axial direction; the guide cover is provided with a first inner cavity which is penetrated, and the guide seat is used for penetrating the first inner cavity from the first end to the second end in the direction from the third end to the fourth end; one of the guide cover and the guide seat is provided with a first buckling part and a second buckling part, and the other one of the guide cover and the guide seat is provided with a first buckling seat and a second buckling seat; the first buckling part is used for matching and buckling with the first buckling seat so as to limit radial displacement and axial displacement of the guide cover relative to the guide seat; the second buckling part is used for matching and buckling with the second buckling seat so as to limit radial displacement, axial displacement and circumferential rotation of the guide cover relative to the guide seat; wherein, in the guide seat penetrates the in-process of first inner chamber, first buckle portion with distance between the first buckle seat is less than second buckle portion with distance between the second buckle seat. So configured, the action of the matching and clamping of the first clamping part and the first clamping seat is earlier than the matching and clamping of the second clamping part and the second clamping seat, and the matching and clamping of the second clamping part and the second clamping seat is carried out after the first clamping part and the first clamping seat are separated. When the first buckling part is matched and buckled with the first buckling seat, the guide cover and the guide seat do not have radial displacement, the axial displacement is limited to be in a coaxial stable state, so that the conical head of the conveying device is conveniently sleeved in, and the implant is conveniently compressed in the next step; when the second buckling part is matched and buckled with the second buckling seat, the guide cover and the guide seat do not have radial displacement, axial displacement and circumferential rotation, and the guide cover and the guide seat are in a relatively fixed state, so that the implant can be prevented from being twisted, inclined or worn in the compression process. In addition, adopt buckle portion and buckle seat to match the mode of block to connect guide lid and guide seat, convenient operation has improved the loading efficiency of implant.

The following description refers to the accompanying drawings.

Referring to fig. 1 to 13, wherein fig. 1 is a front view of a guide cap of a loading tool for an implant according to an embodiment of the present invention, fig. 2 is an axial sectional view of the guide cap shown in fig. 1 along a line A-A, fig. 3 is an axial sectional view of the guide cap of the loading tool for an implant according to a preferred embodiment of the present invention, fig. 4 is a front view of a guide seat of the loading tool for an implant according to an embodiment of the present invention, fig. 5 is an axial sectional view of the guide cap shown in fig. 4 along a line B-B, fig. 6 is a front view of the guide cap of the loading tool for an implant according to an embodiment of the present invention after being engaged with the guide seat, fig. 7 is an axial sectional view of the loading tool for an implant shown in fig. 6 along a line C-C, fig. 8 is a schematic view of a delivery device according to an embodiment of the present invention, fig. 9 is a front view of the delivery device according to an embodiment of the present invention, wherein the delivery device is used with a fourth end of a guiding seat, fig. 10 is an axial cross-section of the delivery device according to fig. 9, wherein the delivery device is used with a loading tool of an implant, fig. 11 is a front view of the delivery device according to an embodiment of the present invention, wherein the delivery device is used with a third end of the guiding seat, fig. 12 is an axial cross-section of the delivery device according to fig. 11, and fig. 13 is a schematic view of an implant according to an embodiment of the present invention.

As shown in fig. 1 to 7, the present embodiment provides an implant loading tool, which includes a guide cover 1 and a guide seat 2, wherein the guide seat 2 is detachably connected with the guide cover 1, the guide cover 1 has a first cavity 100 therethrough, and the guide seat 2 is used for penetrating the first cavity 100 to form an assembly body for compressing an implant. The guiding cover 1 has a first end 101 and a second end 102 opposite to each other in the axial direction, and the guiding seat 2 has a third end 201 and a fourth end 202 opposite to each other in the axial direction. The guiding seat 2 is configured to penetrate the first inner cavity 100, preferably coaxially, from the first end 101 to the second end 102 in a direction from the third end 201 to the fourth end 202.

Preferably, as shown in fig. 1 and 2, the first inner cavity 100 of the guiding cover 1 comprises a first region 13, a second region 16, a third region 15 and a fourth region 14 connected in sequence from a first end 101 to a second end 102; the inner diameter of the first region 13 remains unchanged along the axial direction of the guiding cover 1 (i.e. the inner diameter of the e section and the d section in fig. 2 is the same), the end of the first region 13 near the first end 101 is provided with a plurality of tooth grooves 180 along the circumferential direction, and a section of groove space 181 is formed between every two tooth grooves 180; in practice, the first zone 13 is intended to be in contact with, against or in connection with the guide seat.

The guiding cover 1 is provided with a first buckling part 17 and a second buckling part 12, and the guiding seat 2 is correspondingly provided with a first buckling seat 22 and a second buckling seat 24; the first fastening portion 17 is configured to be fastened with the first fastening seat 22 in a matching manner, so as to limit radial displacement and axial displacement of the guide cover 1 relative to the guide seat 2; the second fastening portion 12 is configured to matingly engage with the second fastening seat 24 to limit radial displacement, axial displacement, and circumferential rotation of the guide cover 1 relative to the guide seat 2. Wherein, during the process of penetrating the guide seat 2 into the first inner cavity 100, the distance between the first fastening portion 17 and the first fastening seat 22 is smaller than the distance between the second fastening portion 12 and the second fastening seat 24. It should be understood that, the distance between the fastening portion and the fastening seat refers to the axial distance along the guiding cover 1 and the guiding seat 2, which has directionality, and since the guiding seat 2 penetrates the first inner cavity 100 from the first end 101 to the second end 102 in the direction from the third end 201 to the fourth end 202, the direction from the second end 102 to the third end 201 can be the positive direction during the process of penetrating the guiding seat into the first inner cavity. Taking the distance between the first fastening portion 17 and the first fastening seat 22 as an example, when the first fastening portion 17 is closer to the second end 102 than the first fastening seat 22, the distance is a positive value, when the first fastening portion 17 is farther from the second end 102 than the first fastening seat 22, the distance is a negative value, and when the distance between the first fastening portion 17 and the first fastening seat 22 is the same as the distance between the first fastening portion 17 and the second end 102, the first fastening portion 17 and the first fastening seat 22 are in a fastening state, and the distance between the two is 0; Similarly, the distance between the second fastening portion 12 and the second fastening seat 24 has the same directionality. Because the distance between the first fastening portion 17 and the first fastening seat 22 is smaller than the distance between the second fastening portion 12 and the second fastening seat 24, when the guiding seat 2 penetrates into the first inner cavity 100, the first fastening portion 17 and the first fastening seat 22 will be matched and fastened first; when the guide seat 2 continues to penetrate into the first inner cavity 100, the first fastening portion 17 is separated from the first fastening seat 22, and the distance between the two is a negative value until the second fastening portion 12 is engaged with the second fastening seat 24. In this way, the matching and locking action of the first locking portion 17 and the first locking seat 22 is guaranteed to be earlier than the matching and locking action of the second locking portion 12 and the second locking seat 24, and the matching and locking action of the second locking portion 12 and the second locking seat 24 are guaranteed to be carried out after the first locking portion 17 and the first locking seat 22 are separated. When the first buckling part 17 is matched and buckled with the first buckling seat 22, the guide cover 1 and the guide seat 2 have no radial displacement, the axial displacement is limited to be in a coaxial stable state, so that the conical head of the conveying device is convenient to be sleeved in, and the implant is convenient to be compressed in the next step; when the second fastening part 12 is fastened with the second fastening seat 24, the guiding cover 1 and the guiding seat 2 have no radial displacement, axial displacement and circumferential rotation, and the guiding cover 1 and the guiding seat 2 are in a relatively fixed state, so that the implant can be prevented from twisting, tilting or wearing in the compression process. In addition, adopt buckle portion and buckle seat to match the mode of block to connect guide lid 1 and guide seat 2, convenient operation has improved the loading efficiency of implant. It should be understood that in some other embodiments, the first fastening portion 17 and the second fastening portion 12 are not limited to be disposed on the guide cover 1, and the first fastening seat 22 and the second fastening seat 24 are not limited to be disposed on the guide seat 2; it is also possible that the first fastening portion 17 and the second fastening portion 12 are disposed on the guide seat 2, and the first fastening seat 22 and the second fastening seat 24 are disposed on the guide cover 1, which results in a similar effect to the present embodiment.

Preferably, the first fastening portion 17 has a first fastening surface 171 facing the second end 102 and a first coupling surface 172 facing the inside of the guide cover 1, and the first fastening seat 22 has a second fastening surface 221 facing the third end 201 and a second coupling surface 222 facing the outside of the guide seat 2; the first engaging surface 172 is used to abut against the second engaging surface 222 to limit the radial displacement of the guide cap 1 relative to the guide seat 2, the first engaging surface 171 is used to abut against the second engaging surface 221 to limit the axial displacement of the guide cap 1 relative to the guide seat 2, so that the first engaging portion 17 is engaged with the first engaging seat 22, during the process of penetrating the guide seat 2 into the first inner cavity 100, the guide seat 2 is approaching toward the first inner cavity 100 in the direction of the third end 201 toward the fourth end 202 as shown in fig. 4, the fourth end 202 first enters the first inner cavity 100 from the first end 101 of the guide cap 1, then the guide seat 2 continues to advance toward the second end 102 of the guide cap 1 until the first engaging portion 17 is engaged with the first engaging seat 22, at this time, the guide cap 1 is not displaced radially relative to the guide seat 2, and the axial displacement of the guide cap 1 relative to the guide seat 2 is limited, i.e. the axial displacement of the guide cap 1 relative to the guide seat 2 is limited, which is not required to be limited, by the axial displacement of the first engaging portion 17 and the first engaging seat 22, relative to the first engaging seat 2 is limited, and the axial displacement of the guide cap 1 is limited relative to the axial displacement of the guide cap 2 is limited relative to the first end 2. When the guide seat 2 continues to advance toward the second end 102 of the guide cover 1, the first locking portion 17 is separated from the first locking seat 22. In particular, the first fastening portion 17 is separated from the first fastening seat 22, which means that the first fastening surface 171 and the second fastening surface 221 are separated from each other, and the abutting relationship between the first combining surface 172 and the second combining surface 222 is not limited, that is, the first fastening portion 17 is separated from the first fastening seat 22, and the direction of the guiding seat 2 toward the second end 102 is deeper into the first inner cavity 100 relative to the first locking state, and the radial displacement of the guiding cover 1 and the guiding seat 2 is further limited by the abutting relationship between the first combining surface 172 and the second combining surface 222. So configured, the guide cap 1 and the guide seat 2 are in a coaxial stable state, facilitating the insertion of the conical head of the delivery device for the next compression of the implant. It should be noted that, in the present embodiment, the first fastening portion 17 and the first fastening seat 22 abut against the second fastening surface 221 through the first fastening surface 171 to achieve the axial limitation of the guide cover 1 and the guide seat 2, and in other embodiments, the first fastening portion 17 and the first fastening seat 22 may also be in a fastening manner by friction force, or the groove and the protrusion may cooperate with each other to achieve the axial limitation of the guide cover 1 and the guide seat 2.

More preferably, the first fastening portion 17 is disposed on the slot portion 181 of the first area 13, as shown in fig. 4, the direction of the first fastening seat 22 towards the fourth end 202 is further provided with a slope disposed along the circumferential direction of the guiding seat 2, the slope gradually expands from the fourth end 202 towards the third end 201 to form a flared end, and the maximum outer diameter of the slope is greater than the outer diameter of the second combining surface 222, and the inner diameter of the first combining surface 172 is preferably the same as the outer diameter of the second combining surface 222 or slightly smaller than the outer diameter of the second combining surface 222, so as to form a size fit or an interference fit. Since the first region 13 of the guide cap 1 is divided into a plurality of sub-portions in the circumferential direction by the plurality of tooth grooves 180. During pushing of the guiding seat 2 into the first inner cavity 100 of the guiding cover 1, the sub-portions are all easily elastically deformed under the guiding of the sloping surface to expand radially outwards of the guiding cover 1 until the first combining surface 172 abuts against the second combining surface 222 to limit that the guiding cover 1 and the guiding seat 2 are not radially displaced. It will be appreciated that the number of splines 180 may be selected to be different, such as 2 to 12, as desired. The tooth grooves 180 are preferably uniformly distributed around the circumference of the guide cover 1, so that the plurality of inter-groove portions 181 are symmetrically distributed in the circumference of the guide cover 1, such as axisymmetric, centrosymmetric, or rotationally symmetric. Furthermore, the first fastening portion 17 may be provided on all the inter-slot portions 181, preferably only on part of the inter-slot portions 181, so as to achieve both of the ensured coaxial fixation and the easy disassembly; more preferably, the first fastening parts 17 are symmetrically distributed around the circumferential center of the guiding cover 1, so as to ensure that the guiding cover 1 is uniformly stressed and does not incline when being combined with the guiding seat 2.

Further, the second fastening portion 12 includes a plurality of second fasteners, and the second fastening seat 24 includes a plurality of second fastening slots that are matched with the second fasteners; the second card slot is configured to: during penetration of the guide seat 2 into the first inner cavity 100, radial displacement and circumferential rotation of the guide cover 1 relative to the guide seat 2 are defined; after the guide seat 2 penetrates into the first inner cavity 100, radial displacement, axial displacement and circumferential rotation of the guide cover 1 relative to the guide seat 2 are limited. The second buckle is matched with the second clamping groove, is an active buckle-clamping groove matching, and is preferably an elastic buckle-clamping groove matching. Specifically, as shown in fig. 1 and 2, the second fastening devices may be disposed on the inter-slot portions 181, and the second fastening devices are two and symmetrically disposed on one inter-slot portion 181 on both sides of the axis of the guiding cover 1.

Preferably, each of the second latches has a first inclined surface 121; each of the second clamping grooves is provided with a second inclined surface 241 matched with the first inclined surface 121, the first inclined surface 121 forms an included angle with the axial direction of the guide cover 1, the first inclined surface 121 is preferably gradually enlarged from the first end 101 to the second end 102, and the included angle is more than 0 degree and less than 60 degrees, more preferably more than 0 degree and less than 30 degrees, so as to facilitate the second clamping buckle to be inserted into the second clamping groove; during penetration of the guide seat 2 into the first cavity 100, the second inclined surface 241 abuts against the first inclined surface 121 to limit radial displacement of the guide cover 1 relative to the guide seat 2. Each second buckle is provided with a third limiting surface 123 arranged along the circumferential direction of the guide cover 1, and each second clamping groove is provided with a fourth limiting surface 243 matched with the third limiting surface 123; the third limiting surface 123 and the fourth limiting surface 243 abut against each other to limit circumferential rotation of the guide cover 1 relative to the guide seat 2. Each second buckle has a third engaging surface 122 disposed toward the second end 102, and each second slot has a fourth engaging surface 242 that mates with the third engaging surface 122. After the guide seat 2 penetrates into the first inner cavity 100, the third engaging surface 122 and the fourth engaging surface 242 abut against each other to limit the axial displacement of the guide cover 1 relative to the guide seat 2. As shown in fig. 4 and 5, the second clamping groove is provided with a groove cavity 244 matched with the second clamping groove, the groove cavity 244 can be used for inserting the second clamping groove, as shown in fig. 5, the second inclined surface 241 and the fourth limiting surface 243 are the inner walls of the groove cavity 244, the fourth limiting surfaces 243 are two opposite arranged, the third limiting surfaces 123 are two corresponding side walls of the second clamping groove along the circumferential direction of the guiding cover 1, when the second clamping groove is inserted into the groove cavity 244 of the second clamping groove, the two side walls of each second clamping groove are abutted against the two fourth limiting surfaces 243 of the corresponding groove cavity 244, and therefore the guiding cover 1 is limited to rotate relative to the guiding seat 2 in a non-circumferential direction. As shown in fig. 7, the second inclined surface 241 is used for guiding the first inclined surface 121, specifically, when the guiding seat 2 penetrates into the first inner cavity 100, the second inclined surface 241 abuts against the first inclined surface 121, and since the first inclined surface 121 and the second inclined surface 241 matching with the first inclined surface are both at an included angle with the axial direction of the guiding cover 1, the inner diameter of the first inclined surface 121 is gradually enlarged from the first end 101 to the second end 102, i.e. both the first inclined surface 121 and the second inclined surface 241 are inclined inwards towards the direction of inserting the second buckle into the second clamping groove, and the portion of the second buckle close to the first end 101 forms an inclined wedge shape. So configured, on the one hand, when the second buckle is inserted into the second slot, since the second inclined surface 241 gradually contracts toward the third end 201, the second inclined surface 241 can generate a component force radially toward the inside of the guide seat 2 on the first inclined surface 121, so that the second buckle generates a certain deformation, and the resilience of the second buckle can reliably enable the first inclined surface 121 and the second inclined surface 241 to abut together, so as to ensure that the guide cover 1 has no radial displacement relative to the guide seat 2. On the other hand, by elastic deformation of the second catch, the second inclined surface 241 can generate an axial component force towards the fourth end 202 with respect to the first inclined surface 121, and the axial movement of the second catch towards the third end 201 of the guiding seat 2 can be limited by the existence of the force, and when the external pushing force is smaller than the axial component force towards the fourth end 202, the component force can enable the first engaging surface 171 to abut against the second engaging surface 221 well, so that the guiding cover 1 can be further limited to move axially with respect to the guiding seat 2 when the guiding cover 1 and the guiding seat 2 are in the first locking state.

Further, each of the second buckles has a third engaging surface 122 disposed toward the second end 102, and each of the second slots has a fourth engaging surface 242 that mates with the third engaging surface 122; after the guide seat 2 penetrates into the first inner cavity 100, the third engaging surface 122 and the fourth engaging surface 242 abut against each other to limit the axial displacement of the guide cover 1 relative to the guide seat 2. After the guide seat 2 penetrates the first cavity 100, the guide cover 1 and the guide seat 2 form a fixed assembly relationship, that is, the guide cover 1 and the guide seat 2 are in the second locking state, and the fourth end 202 extends out of the second end 102 along the direction from the first end 101 to the second end 102 (preferably, the outer diameter of the fourth end 202 of the guide seat 2 is smaller than the inner diameter of the second end 102 of the guide cover 1, so that the fourth end 202 extends out of the second end 102). As shown in fig. 6 and 7, at this time, first inclined surface 121 is disengaged from second inclined surface 241, and first inclined surface 121 is located closer to third end 201 than second inclined surface 241. At this time, the third engaging surface 122 abuts against the fourth engaging surface 242, and the guide cover 1 is limited to have no axial displacement with respect to the guide seat 2. It should be understood that, here, the third engaging surface 122 and the fourth engaging surface 242 are not axially displaced relative to the guide seat 2 by abutting the defined guide cover 1, that is, the guide cover 1 is not axially displaced relative to the guide seat 2 in the axial direction of the second end 102, and the axial displacement of the guide cover 1 relative to the guide seat 2 in the axial direction of the first end 101 may be limited by other portions of the guide cover 1 and the guide seat 2, for example, opposite limiting steps may be respectively provided on the guide cover 1 and the guide seat 2, and the directions of the limiting steps may be opposite to the third engaging surface 122 and the fourth engaging surface 242, so that when the third engaging surface 122 and the fourth engaging surface 242 are engaged and abutted, the two limiting steps are also abutted against each other, so that axial displacements in both directions of the guide cover 1 and the guide seat 2 may be limited. Of course, the axial limitation of the guide cover 1 and the guide seat 2 is not limited by the above scheme, and the invention is not limited by friction force.

Further, the second buckle further has a fifth limiting surface 124, the fifth limiting surface 124 is disposed towards the outside of the guiding cover 1, and when the third engaging surface 122 engages with and abuts against the fourth engaging surface 242, the fifth limiting surface 124 abuts against the second inclined surface 241 (particularly, a portion of the second inclined surface 241 near the third end 201), so that the second inclined surface 241 further limits the guiding cover 1 from being radially displaced relative to the guiding seat 2 by the fifth limiting surface 124. The outer diameter of the fifth limiting surface 124 is preferably not smaller than the minimum inner diameter of the second inclined surface 241 (i.e. the inner diameter of the second inclined surface 241 near the third end 201), and particularly, when the outer diameter of the fifth limiting surface 124 is slightly larger than the minimum inner diameter of the second inclined surface 241, the radial displacement of the guiding cover 1 relative to the guiding seat 2 can be better limited by the rebound force generated by the deformation of the second buckle.

Still further, the third engaging surface 122 of the guiding cover 1 and the first engaging surface 171 are oriented in the same direction, the fourth engaging surface 242 of the guiding seat 2 and the second engaging surface 221 are oriented in the same direction, and during the process of penetrating the guiding seat 2 into the first cavity 100, the distance between the second engaging surface 221 and the first engaging surface 171 is smaller than the distance between the fourth engaging surface 242 and the third engaging surface 122, so that the matching engagement of the first fastening portion 17 and the first fastening seat 22 can be ensured before the matching engagement of the second fastening portion 12 and the second fastening seat 24, and the second fastening portion 12 and the second fastening seat 24 are matched and fastened after the first fastening portion 17 and the first fastening seat 22 are separated.

Preferably, the distance between the bottom end of the second clamping groove facing the fourth end 202 and the top end of the second clamping part 12 facing the first end 101 is smaller than the distance between the first clamping part 17 and the first clamping seat 22 (the distance here refers to the axial distance along the guiding cover 1 and the guiding seat 2, which has directionality, since the guiding seat 2 penetrates the first inner cavity 100 from the first end 101 to the second end 102 in the direction of the third end 201 to the fourth end 202, the direction of the second end 102 to the third end 201 can be positive during the penetrating of the guiding seat into the first inner cavity), so that when the first clamping part 17 is clamped with the first clamping seat 22, part of the second clamping part 12 enters the second clamping groove, and when the first clamping is realized, that is, the radial displacement, the axial displacement and the circumferential rotation of the guiding cover and the guiding cover are limited.

When the guide cover 1 and the guide seat 2 are in the second locked state, the third engagement surface 122 and the fourth engagement surface 242 are released from abutment by applying pressure to the second engagement portion 12 toward the inside of the guide cover 1, and further, the guide cover 1 and the guide seat 2 are released from the second locked state by applying thrust to the second engagement portion 12 toward the second end 102 of the guide cover 1. Further, by applying a pushing force to the guide cover 1 toward the second end 102 or a pulling force to the guide seat 2 toward the third end 201 (or by simultaneously applying a force to both the guide cover 1 and the guide seat 2), both the guide cover 1 and the guide seat 2 can be separated from each other by further releasing the first locking state.

In other embodiments, the number of the second buckle and the second slot is not limited to two, and two sides of the second buckle are adjacent to the slot portion 181 through the tooth slot 180, and two sidewalls of the tooth slot 180 adjacent to the second buckle may form the third limiting surface 123. The second buckles are uniformly distributed along the circumferential direction of the guide cover 1, and the second clamping grooves are uniformly distributed along the circumferential direction of the guide seat 2. The second buckles and the second clamping grooves which are uniformly distributed can enable the stress to be more uniform when the guide cover 1 is combined with the guide seat 2, and inclination is not easy to occur. The number of the second buckle and the second clamping groove can be set differently according to the requirement, and the invention is not limited to this.

As shown in fig. 2 and 3, the first cavity 100 of the guiding cover 1 is divided from the first end 101 to the second end 102 into a first region 13, a second region 16, a third region 15 and a fourth region 14 which are sequentially connected, wherein an inner diameter (an inner diameter of a section d) of the second region 16 near the first end 101 is larger than an inner diameter (an inner diameter of a section a) of the fourth region 14 near the second end 102; the inner diameter of the third zone 15 near the first end 101 (inner diameter of section c) and the inner diameter near the second end 102 (inner diameter of section b) may be the same or different and are both smaller than the inner diameter of the second zone 16 near the first end 101 (inner diameter of section d) and larger than the inner diameter of the fourth zone 14 near the second end 102 (inner diameter of section a). In practice, the second region 16, the third region 15 and the fourth region 14 are all used to compress the implant.

Preferably, the cross sections of the first region 13, the second region 16, the third region 15 and the fourth region 14 are all circular, and the generatrix (geometric term, curved shape can be regarded as a locus when a line moves, namely a generatrix) of the first region 13, the second region 16, the third region 15 and the fourth region 14 is all straight line, as shown in fig. 2. That is, the first region 13 is cylindrical, the second region 16 is a truncated cone with a larger bottom surface facing the first end 101, the third region 15 is cylindrical or truncated cone, and the fourth region 14 is a truncated cone with a larger bottom surface facing the first end 101, and more preferably, all of the bus bars of the first region 13, the second region 16, the third region 15 and the fourth region 14 are in smooth transition; the first lumen 100 thus configured is used to compress an implant with good results. Of course, the buses of the first region 13, the second region 16, the third region 15 and the fourth region 14 may be hard-crossed by straight lines to form corners instead of smooth transition, or any two of the four regions may be smooth transition, which is not limited by the present invention.

In other embodiments, the cross-sections of the first region 13, the second region 16, the third region 15 and the fourth region 14 are all circular, the bus bars of the third region 15 and the fourth region 14 are curved, and the bus bars of the third region 15 smoothly transition with the bus bars of the fourth region 14 and the second region 16, respectively, as shown in fig. 3. The generatrix of the third area 15 is a concave curve towards the guiding cover 1, which is beneficial to improving the fixing degree of the implant under the action of no external force and is more convenient for an operator to adjust the deviation of the posture of the implant in the compression process. The generatrix of the fourth region 14 may be curved, for example, convex toward the guide cover 1, and the generatrix of the fourth region 14 may be straight, which is not limited in the present invention.

It should be understood that the cross-section of the first cavity 100 gradually decreases from the first end 101 to the second end 102, which means that the cross-section of the first cavity 100 tends to decrease from the first end 101 to the second end 102, and that any cross-section of the first cavity 100 must not be larger than the cross-section located closer to the second end 102. For example, when the generatrix of the third region 15 is a curve concave toward the guiding cover 1, a certain concave cross section in the concave portion of the third region 15 may be larger than a cross section of the third region 15 near the first end 101, and the overall trend of the third region 15 is that the cross section of the first inner cavity 100 gradually decreases from the first end 101 to the second end 102.

Referring to fig. 5, the guide seat 2 has a second inner cavity 200 passing through in an axial direction, and a cross section of the second inner cavity 200 gradually decreases from the third end 201 to the fourth end 202. Similarly, the cross-section of the second lumen 200 gradually decreases from the third end 201 to the fourth end 202, which means that the trend of change is gradually decreasing, not limiting. Preferably, the second cavity 200 includes a fifth region 25 and a sixth region 26 connected from the third end 201 to the fourth end 202; an inner diameter (h-section inner diameter) of the fifth region 25 near the third end 201 is greater than an inner diameter (g-section inner diameter) of the fifth region 25 near the fourth end 202; the inner diameter (inner diameter of section g) of the sixth section 26 near the third end 201 is equal to the inner diameter of the fifth section 25 near the fourth end 202 and is not smaller than the inner diameter (inner diameter of section f) of the sixth section 26 near the fourth end 202. In practice, the fifth zone 25 is used to compress the implant.

Preferably, the cross sections of the fifth region 25 and the sixth region 26 are all circular, and the generatrix of the fifth region 25 and the sixth region 26 is all straight, that is, the fifth region 25 is in a truncated cone shape with the larger bottom surface facing the third end 201, and the fifth region 25 is in a cylindrical shape or a truncated cone shape. More preferably, the bus bars of the fifth zone 25 and the sixth zone 26 are in smooth transition. The second lumen 200 thus configured is used to compress an implant with good results. Of course, the corner may be formed by a straight line hard junction instead of a smooth transition between the bus bars of the fifth region 25 and the sixth region 26; or one or both of the generatrix of the fifth region 25 and the sixth region 26 is curved, for example, the generatrix of the sixth region 26 may be a smoothly transitive arc, or a combination of straight lines and curved lines. The invention is not limited to this, and can achieve better effect in practical use.

Further, as shown in fig. 5, the outer wall of the guide seat 2 is provided with a fixing groove 23 having a recess in the circumferential direction, and the recess of the fixing groove 23 faces the direction of the fourth end 202. The fixation groove 23 is used for insertion and abutment of the implant to limit axial displacement of the implant in the direction of the third end 201.

Preferably, the outer peripheral walls of the guiding cover 1 and the guiding seat 2 are provided with anti-slip structures 19 for easy grasping. As shown in fig. 1, the anti-slip structure 19 on the guide cover 1 may be provided on the outer surface of the guide cover 1, for example, may be an annular anti-slip rib along the circumferential direction of the guide cover 1. As shown in fig. 4, the anti-slip structure 19 on the guide seat 2 may be disposed on an outer surface of the guide seat 2, for example, may be an anti-slip recess or the like. The first inclined surface 121 of the second buckle may also be provided with an anti-slip structure, such as an anti-slip groove or an anti-slip tooth. The present invention is not particularly limited to the anti-slip structure as long as it can facilitate gripping or increase friction with an operator.

More preferably, the guide cap 1 is made of a transparent material such as Polycarbonate (PC), etc., and the guide cap 1 is provided with an indication ring 11 in the circumferential direction to indicate the loading progress of the implant. The indication ring 11 is used to indicate the implant in the loading tool to reach a predetermined compression degree, and the indication ring 11 may be used to indicate the next operation, which may be a paint mark, a groove, a convex edge or other marking modes for waking up, and may also be used to indicate the operator in combination with a sound or a light in an external handle, etc., the setting position of the indication ring 11 may be determined according to the initial compression degree of the implant, and the indication ring 11 may be not limited to be annular, or may be dot-shaped, block-shaped, etc. When the implant is compressed and loaded to the position of the indicator ring 11, the guide cover 1 and the guide seat 2 are opened and the next operation is performed. It should be understood that the guide cover 1 is made of a transparent material here, and is not limited to the guide cover 1 being made of a transparent material as a whole, but only a part of the guide cover 1 needs to be made of a transparent material, such as the second region 16 to the fourth region 14 being made of a transparent material, etc. The whole guiding cover 1 may be integrally formed, or may be divided into a plurality of parts to be combined by welding, fusing or bonding, for example, the first region 13 and the second fastening portion 12 may be made of a material with better elasticity, and then be fixedly assembled with the second region 16 to the fourth region 14 made of a transparent material, which is not limited in this invention.

Referring to fig. 8 to 13, the present embodiment further provides a medical device, including the implant loading tool as described above, and further including a delivery device 5, wherein the implant loading tool is configured to cooperate with the delivery device 5 to load an implant into the delivery device 5. The implant, which refers to a compressible implant such as a heart valve stent, is not particularly limited in terms of the geometry and materials of the implant, and may be any of the existing implants in the art.

The manner of use of the loading tool of the implant, as well as the structure and principle of the medical device, will now be described with reference to the accompanying drawings, taking a valve holder 9 as an example of an implant.

Please refer to fig. 13, which shows a valve stent 9, comprising an outflow tract 93, an inflow tract 92 and hanging lugs 91, wherein the valve stent 9 is compressed and loaded into the delivery device 5 with the aid of the delivery device 5 by the loading tool provided in the present embodiment. In use, the valve stent 9 is then delivered by the delivery device 5 through the catheter into the patient to the target area in a contracted state and released and deployed into the state shown in fig. 13.

Referring to fig. 8, a delivery device 5 includes a conical head 54, a fixing head 55, a sheath 56, and a catheter and a handle (not shown), wherein the conical head 54 is fixedly connected with the fixing head 55, and the fixing head 55 is disposed in the sheath 56 in a penetrating manner. The fixing head 55 is fixed with the handle through a connecting piece, and the sheath tube 56 moves under the control of the handle to relatively expose the fixing head 55 for the fixing head 55 to be connected with the hanging lugs 91 of the valve support 9 so as to be used as a force application end for applying force to the valve support 9.

In use, the implant loading tool firstly places the inflow channel 92 of the valve support 9 on the fixing groove 23 of the guide seat 2, then presses the guide cover 1 from the outflow channel 93 of the valve support 9 towards the guide seat 2 (i.e. the guide seat 2 penetrates into the first inner cavity 100), so that the first buckling part 17 of the guide cover 1 is matched and buckled with the first buckling seat 22 of the guide seat 2, and the guide cover 1 and the guide seat 2 are relatively fixed in the axial direction. At this point, the valve holder 9 is first compressed by the second region 16 of the guided cap 1, because one end is limited by the fixing groove 23, and one end of the outflow tract 93 slides into the third region 15. At this time, the first fastening portion 17 is engaged with the first fastening seat 22 in a matching manner, so that the guide cover 1 and the guide seat 2 form a first locking state, and the guide cover 1, the guide seat 2 and the valve support 9 are in a coaxial stable state, so as to be conveniently sleeved into the conical head 54 for further compression.

As shown in fig. 4, the conical head 54 penetrates into the second inner cavity 200 from the fourth end 202 of the guiding seat 2 (the guiding cover 1 and the guiding seat 2 are in the first locking state, the valve support 9 is installed between the guiding cover 1 and the guiding seat 2), further, the hanging lugs 91 are aligned with the fixing head 55, and then the guiding cover 1 is pushed continuously in the direction of the guiding seat 2, so that the second fastening part 12 is fastened with the second fastening groove 24, during this process, part of the outflow channel 93 of the valve support 9 is pushed out of the fourth area 14 from the third area 15, so as to form a fixed fit of the guiding cover 1, the guiding seat 2 and the valve support 9, so that the hanging lugs 91 are fastened in the grooves of the fixing head 55, as shown in fig. 9 and 10. After confirming that the hanging lugs 91 are caught in the grooves of the fixing head 55, the sheath tube 56 is moved in the direction of the inflow path 92 (i.e., the direction of the third end 201 of the guide seat 2, right side in the drawing) by the operation of the handle, so that the valve holder 9 is moved toward the inside of the sheath tube 56, and the valve holder 9 starts to be loaded into the sheath tube 56. In this process, the loading progress of the valve stent 9 can be observed through the transparent guide cap 1, and the loading of the valve stent 9 in the first stage is completed when the bottom (i.e., the lower end in fig. 13) of the inflow channel 92 reaches or approaches the indicator ring 11 of the guide cap 1. In the loading process of the valve support 9 in the first stage, as the guide cover 1 and the guide seat 2 can realize radial, circumferential and axial fixation, the valve support 9 can be effectively prevented from twisting, tilting or wearing in the compression process, and the compression process of the valve support 9 can be stably carried out.

Referring to fig. 11 and 12, after the valve holder 9 is loaded in the first stage, the second fastening portion 12 is pressed to separate the guide seat 2 and the guide cover 1, the guide cover 1 moves to the left in the drawing (not shown in the drawing), the valve holder 9 is exposed, the guide seat 2 is inverted (i.e. the direction of the third end 201 and the fourth end 202 is exchanged), the fourth end 202 moves to the direction of the sheath 56 (left in the drawing) in the direction of the third end 201, the inflow channel 92 of the valve holder 9 is pushed into the sixth region 26 through the fifth region 25 of the guide seat 2, and the outer diameter of the outflow channel 93 is compressed to be close to the inner diameter of the sheath 56. Then, by continuing to operate the handle, the sheath tube 56 is pushed to advance, and then the valve support 9 is pulled to move to the left in the drawing, and the valve support 9 is completely loaded into the sheath tube 56, so that the whole loading process of the valve support 9 is completed.

In summary, after the valve holder 9 is loaded into the loading tool of the implant provided by the present invention, the guide cover 1 and the guide seat 2 may be detachably fixed twice (i.e., the first locking state and the second locking state). The first fastening part 17 and the first fastening seat 22 form first fixation to form a stable state of the guide cover 1, the guide seat 2 and the valve bracket 9 which are coaxial, so as to be convenient for sleeving the conical head 54 for the next operation; the second fastening part 12 and the second fastening seat 24 form second fastening, and the fastening realizes radial, circumferential and axial fastening of the guide cover 1 and the guide seat 2, which is more beneficial to preventing the valve bracket 9 from twisting, tilting or wearing in the compression process; the fixing mode is more firm, so that the valve support 9, the first inner cavity 100 of the guide cover 1, the second inner cavity 200 of the guide seat 2 and the sheath tube 56 are coaxial in the compression process, and the valve support 9 is prevented from twisting or tilting in the compression process. In addition, the guide cover 1 and the guide seat 2 are connected in a buckling mode, so that the valve support 9 is fixed with the guide seat 2 in the loading process of the first stage, the guide cover 1 is convenient to open, the next operation is convenient, the whole operation process is simple and controllable, and the loading efficiency is further improved.

The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims.

Claims

1. An implant loading tool comprising a guide cap and a guide seat for detachable connection with the guide cap, the guide cap having axially opposite first and second ends, the guide seat having axially opposite third and fourth ends; the guide cover is provided with a first inner cavity which is penetrated, and the guide seat is used for penetrating the first inner cavity from the first end to the second end in the direction from the third end to the fourth end;

Wherein, in the process that the guide seat penetrates into the first inner cavity, the distance between the first buckling part and the first buckling seat is smaller than the distance between the second buckling part and the second buckling seat;

The first buckling part and the second buckling part are arranged on the guide cover, and the first buckling seat and the second buckling seat are arranged on the guide seat; the first clamping part is provided with a first clamping surface facing the second end and a first combining surface facing the inside of the guide cover, and the first clamping seat is provided with a second clamping surface facing the third end and a second combining surface facing the outside of the guide seat; the first combining surface is used for abutting against the second combining surface so as to limit the radial displacement of the guide cover relative to the guide seat, the first clamping surface is used for abutting against the second clamping surface so as to limit the axial displacement of the guide cover relative to the guide seat, and the first clamping part is matched and clamped with the first clamping seat;

The cross section of the first inner cavity gradually decreases from the first end to the second end; the first inner cavity comprises a first region, a second region, a third region and a fourth region which are sequentially connected from the first end to the second end; the inner diameter of the first area is kept unchanged along the axial direction of the guide cover, and a plurality of tooth grooves are formed in the end part, close to the first end, of the first area along the circumferential direction; the inner diameter of the second region near the first end is larger than the inner diameter of the fourth region near the second end; the inner diameter of the third region near the first end and the inner diameter near the second end are smaller than the inner diameter of the second region near the first end and are larger than the inner diameter of the fourth region near the second end;

the second buckling part comprises a plurality of second buckles, and the second buckling seat comprises a plurality of second clamping grooves matched with the second buckles; the second card slot is configured to:

2. The implant loading tool of claim 1, wherein each of the second snaps has a first ramp; each second clamping groove is provided with a second inclined plane matched with the first inclined plane, and the first inclined plane forms an included angle with the axial direction of the guide cover; in the process that the guide seat penetrates into the first inner cavity, the second inclined surface abuts against the first inclined surface.

3. The implant loading tool of claim 2, wherein the first ramp has a cleat disposed thereon.

4. The implant loading tool according to claim 1, wherein each of the second snaps has a third stop surface disposed along a circumferential direction of the guide cap, and each of the second detents has a fourth stop surface that mates with the third stop surface; the third limiting surface and the fourth limiting surface are abutted against each other to limit circumferential rotation of the guide cover relative to the guide seat.

5. The implant loading tool of claim 1, wherein each of the second snaps has a third engagement surface disposed toward the second end, each of the second detents having a fourth engagement surface that mates with the third engagement surface; after the guide seat penetrates into the first inner cavity, the third clamping surface and the fourth clamping surface are abutted against each other to limit axial displacement of the guide cover relative to the guide seat.

6. The implant loading tool according to claim 1, wherein a plurality of the second snaps are uniformly distributed along a circumferential direction of the guide cap and a plurality of the second detents are uniformly distributed along a circumferential direction of the guide seat.

7. The implant loading tool of claim 1, wherein when the first catch matingly engages the first catch, a portion of the second catch enters the second slot, defining an axial radial displacement and a circumferential rotation of the guide cap relative to the guide seat.

8. The implant loading tool according to claim 1, wherein the guide seat has a second lumen extending axially therethrough, the second lumen tapering in cross-section from the third end to the fourth end.

9. The implant loading tool of claim 8, wherein the second lumen comprises, in order from the third end to the fourth end, a fifth region and a sixth region connected;

10. The implant loading tool according to claim 1, wherein the outer wall of the guide seat is provided with a fixing groove with a recess in the circumferential direction, the recess of the fixing groove being directed in the direction of the fourth end.

11. The implant loading tool of claim 1, wherein the fourth end extends beyond the second end in a direction from the first end toward the second end when the second snap feature matingly engages the second snap feature.

12. The implant loading tool according to claim 1, wherein the guide cap and the guide seat are provided with anti-slip structures on the outer peripheral walls thereof for easy gripping.

13. The implant loading tool according to any one of claims 1 to 12, wherein the guide cover is made of a transparent material, and an indication ring is provided along a circumferential direction of the guide cover to indicate a loading progress of the implant.

14. A medical device comprising a loading tool for an implant according to any one of claims 1 to 13, and further comprising a delivery device, the loading tool being adapted to cooperate with the delivery device to load an implant into the delivery device.

15. The medical device of claim 14, wherein the implant is a valve stent.